Takashi T Sakamoto, Atmosphere and Ocean Research Institute University of Tokyo, Tokyo, Japan, Shogo Urakawa, Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan, Sachihiko Itoh, Atmos. & Ocean Res. Institute, Kashiwa, Japan, Hiroyasu Hasumi, Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan and Kiyoshi Tanaka, Atmos Ocean Inst, Univ Tokyo, Kashiwa, Chiba, Japan